diff --git a/transpiler/src/test/java/org/jsweet/test/transpiler/NativeStructuresTests.java b/transpiler/src/test/java/org/jsweet/test/transpiler/NativeStructuresTests.java
index d2848e51..5a0856fd 100644
--- a/transpiler/src/test/java/org/jsweet/test/transpiler/NativeStructuresTests.java
+++ b/transpiler/src/test/java/org/jsweet/test/transpiler/NativeStructuresTests.java
@@ -20,6 +20,7 @@ import source.nativestructures.ObjectMaps;
 import source.nativestructures.OverloadWithNative;
 import source.nativestructures.Properties;
 import source.nativestructures.Reflect;
+import source.nativestructures.Sets;
 import source.nativestructures.Strings;
 import source.nativestructures.WeakReferences;
 
@@ -38,6 +39,13 @@ public class NativeStructuresTests extends AbstractTest {
 		}, getSourceFile(Collections.class));
 	}
 
+	@Test
+	public void testSets() {
+		eval((logHandler, result) -> {
+			logHandler.assertNoProblems();
+		}, getSourceFile(Sets.class));
+	}
+
 	@Test
 	public void testStringBuilder() {
 		eval((logHandler, result) -> {
@@ -74,7 +82,8 @@ public class NativeStructuresTests extends AbstractTest {
 	public void testMaps() {
 		eval((logHandler, result) -> {
 			Assert.assertEquals("There should be no errors", 0, logHandler.reportedProblems.size());
-			assertEquals("1,a,2,b,2,a,true,[1, 2],[a, b],1,true,size2=2,1,2,[],empty=true,-null-,1,a,2,b", result.get("trace"));
+			assertEquals("1,a,2,b,2,a,true,[1, 2],[a, b],1,true,size2=2,1,2,[],empty=true,-null-,1,a,2,b",
+					result.get("trace"));
 		}, getSourceFile(Maps.class));
 	}
 
diff --git a/transpiler/src/test/java/source/nativestructures/Sets.java b/transpiler/src/test/java/source/nativestructures/Sets.java
new file mode 100644
index 00000000..552dac82
--- /dev/null
+++ b/transpiler/src/test/java/source/nativestructures/Sets.java
@@ -0,0 +1,26 @@
+package source.nativestructures;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class Sets {
+
+	public static void main(String[] args) {
+		Map<Set, String> map = new HashMap<>();
+		Set s = new HashSet();
+		s.add("1");
+		s.add("2");
+		Set s2 = new HashSet();
+		s2.add("2");
+		s2.add("1");
+		map.put(s, "hi");
+		map.put(s2, "bye");
+
+		System.out.println(map.get(s));
+		// TODO: make this work (see #196)
+		// assert "bye".equals(map.get(s));
+	}
+
+}